X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fio%2Fbackend.h;h=2c03a98a1a4632917ad810f6e1d74d37813d52df;hp=44e64ab165583765cea22a5e08a374eaf5c7dfdc;hb=43185ec669720903fa86aac5f2d1b1ee62e3a12b;hpb=cdffdf5d61f8330cfc3467e73a84876eb3928e9b

diff --git a/ccan/io/backend.h b/ccan/io/backend.h
index 44e64ab1..2c03a98a 100644
--- a/ccan/io/backend.h
+++ b/ccan/io/backend.h
@@ -22,9 +22,45 @@ struct io_listener {
 	void *arg;
 };
 
+enum io_plan_status {
+	/* As before calling next function. */
+	IO_UNSET,
+	/* Normal. */
+	IO_POLLING,
+	/* Waiting for io_wake */
+	IO_WAITING,
+	/* Always do this. */
+	IO_ALWAYS,
+	/* Closing (both plans will be the same). */
+	IO_CLOSING
+};
+
+/**
+ * struct io_plan - one half of I/O to do
+ * @status: the status of this plan.
+ * @io: function to call when fd becomes read/writable, returns 0 to be
+ *      called again, 1 if it's finished, and -1 on error (fd will be closed)
+ * @next: the next function which is called if io returns 1.
+ * @next_arg: the argument to @next
+ * @u1, @u2: scratch space for @io.
+ */
+struct io_plan {
+	enum io_plan_status status;
+
+	int (*io)(int fd, struct io_plan_arg *arg);
+
+	struct io_plan *(*next)(struct io_conn *, void *next_arg);
+	void *next_arg;
+
+	struct io_plan_arg arg;
+};
+
 /* One connection per client. */
 struct io_conn {
 	struct fd fd;
+	bool debug;
+	/* For duplex to save. */
+	bool debug_saved;
 
 	/* always or closing list. */
 	struct io_conn *list;
@@ -44,7 +80,7 @@ void del_listener(struct io_listener *l);
 void backend_new_closing(struct io_conn *conn);
 void backend_new_always(struct io_conn *conn);
 void backend_new_plan(struct io_conn *conn);
-
+void remove_from_always(struct io_conn *conn);
 void backend_plan_done(struct io_conn *conn);
 
 void backend_wake(const void *wait);